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Q.

A driver is $20$ m below sea level. If he goes further down by $10$ m, then find his new position.

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a

10

m

b

- 10

m

c

30

m

d

- 30

m

answer is D.

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Detailed Solution

Given a diver at 20m below sea level, and goes down by 10m.
Let the ground level indicated by 0. Then all distances travelled in the upward direction will be positive and all the distances travelled in the downward direction will be negative.
Question Image

Question Image

From the figure, it is clear that the new position of the driver is

(- 20) - 10 = - 30

⟹

30 m

below sea level.
Therefore, option (4) is correct.

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